The database may be stored on multiple computers, located in the same physical location, or scattered over different networks.
A distributed database consists of two or more files located in different sites. Information in an object-oriented database is represented in the form of objects, as in object-oriented programming. Relational database technology provides the most efficient and flexible way to access structured information. Items in a relational database are organized as a set of tables with columns and rows. 
Relational databases became dominant in the 1980s.The best database for a specific organization depends on how the organization intends to use the data. There are many different types of databases.
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